Mold for concrete work.



PATENTED DEC. 10, 1907.

F. M. STULTS. MOLD FOR CONCRETE WORK.

APPLIOATION FILED A23. 18, 1907..

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F. M. STULTS. MOLD FOR CONCRETE WORK.

APPLICATION FILED APB.18,1907.

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FREDERICK M. S'lUUlS, ()l CHICAGO, ILLINOIS.

- MOLD FOB CONCRETE WORK.

Specification of Letters Patent.

Patented Dec. 10, 1907.

Application filed April 18.1907. Serial No. 368.976.

Be it known that I, Fnnusnron M. S'rUL'rs, citizen of the United States,residing at (.hicago, in the county of Cook and State of lllinois, haveinvented certain new and useful improvements in Molds for Concrete Work,of which the following is a specification.

This invention is a mold or form for concrete work, particularly adaptedfor building concrete chimneys, stand pipes, sewers, culverts, and thelike. The mold comprises a plurality of segmental metal sectionsconnected together by screws, more or less of which sections can be usedin order to form a structure of any desired diameter.

The invention provides means whereby a plurality of the molds can beused, and one mold can be lifted and placed upon another without comlete disconnection of the parts, the screws allowing the sections of onemold to be separated far enough to pass over another mold, withoutcomplete disconnection of the parts, whereby the molds can be raised oneabove the other as the building progresses, and brought together to theproper size to receive the next layer of concrete. The invention isillustrated in the accompanying drawings, in which Figure 1 is a topplan view of the mold. Fig. 2 is a projection showing several of theouter sections in a flat plane. Fig. 3 is a side elevation showing themanner of using the molds in building a chimney or tower. Fig. 4 is aprojection showing several of the inner sections in a ilatplane.

Referring specifically to the drawings, the outer mold is built up of aseries of long sections 6 and short sections 7, the former beingcomparatively long and the latter being comparatively short. Thesesections are segmental in shape, and are preferably made of sheet metal.Each section has at its upper and lower edges an le bars 8, and at itsends has angle bars 9, t e parts being bolted together, and strengthenedby corner plates 10.

The sections fit together at the endsto produce a circular form. Theangle irons 9 at one end are provided with threaded holes to receiveconnecting bolts 11 which extend throughunthreaded'enlarged holes at 12in the flange of the angle iron at the meeting end of the adjacentsection. The unthreaded holes are enlarged to allow for slight variationin angles, to roduce molds of various diameters. ()ne of t 1e longsections 6 is provided at one -tion.

of its ends with long bolts 13 which have bevel gears 14 which mesh withbevel "cars 15 on a cross shaft 16 which isheld in )earings 17 on theangle iron 9. One of the long bolts 13 is provi ed at its rear end witha ratchet lever 18, whereby it may be turned, and by means of theconnecting gearing both of said bolts are turned at the same time. Theangle iron 9 at the said end is set back a few inches from the end ofthe plate 6, forming a lap 19 which fits in a corresponding rabbet 20 inthe end of the adjacent sec- The diameter of the mold may be varied byusing more or less of the short sections 7, or by omitting one or moreof the long sections 6, the bolts and bolt holes being I all the samesize so as to connect any of the flanges.

. In the use of the mold the desired number of sections are joinedtogether to produce a mold of the desired size, and tightened by meansof the bolts, the long bolts 13 being tightened last, by manipulation ofthe ratchet lever 18. And, similarly, the mold may be expanded andloosened from the Work by backin the bolts. 'In the use of the mold forbuilding chimneys and the' like, a lurality of the molds are provided. 0or three will usually be sullicient. These molds are placed one upon theother, and the lower mold is moved and placed upon the upper one as thework progresses. While concrete placed in the upper mold is setting thelower mold section is loosened or expanded by means of the bolts, andthen by means of block and tackle 21, connected to the'frame work 22,the lower mold section is hoisted over the upper mold section, asindicated in Fig. 3, and then the sections are drawn together and placedon top for the next layer; The work may thus progress rapidly, and thesections can be manipulated from the inside or by reaching over the top,without'the necessity for outside staging, and thus permitting theraising of one complete form without taking the sections of said formapart. One of the short sections 7 can be removed at any time todecrease. the diameter of the chimney or tower.

The parts above describedform the outside wall or part of the mold inmaking chim-.

neys, or will be used alone in making columns or pillars. In hollow worksuch as chimneys an mner mold orwall is provided, to be usedincooperation with said outer wall. Said inner mold or wall consists oflong sections 6 made of sheet iron ortwood and having angle bars 8 atits top and bottom edges and angle bars 9 at its ends. There is alsoprovided short sections 7, having similar angle bars and these short andlong sections are connected together b bolts 11; There is also used alain flexible sheet iron section which ms at the-top hooks 21 arrangedto enga e over the angle irons 8 at the top of tl ie other sections, inorder to support the plain section 20 in place. Said section ma be ofany length-desired and is placed to lap the edges of the main sections,the said sections being connected together by long bolts 13". Theinside, wall constructed in this way is located within the chimney,opposite the outside wall above described, and the concrete is placed.between said walls. When it is desired to loosen the inner wall, for thepurpose of removing the same or lifting the same to the next course, itcan be done b turning the bolts 13kt0 draw the ends of the mam sectionstogether. This reduces the diameter of the circular wall and detachesthe parts, from the work. The

1 plain section 20 can then be removed and the sides of the circlefurther reduced until .the

or walls shown can be used. Preferabl two or three sets may be usedwhich Wlll be mounted one upon the other as fast as the work progresses.

I claim: a

The combination of a plurality of molds adapted to be superposed oneupon the other, each of which is composed of a plurality of long andshort sheet metal sections having angle bars at the upper and lower edes and at the ends, and connected at the en s by screws extensible toenlarge the mold and changeable from one to the other, permitting theremoval of one or more of said sectlons, the screws being provided withconnecting means to turn all of them simultaneously.

In testimony whereof I affix my signature,

in presence of two witnesses.

FREDERICK M. STULTS.

